text: Routes are drawn up before departure time to select the shortest and most efficient route?
classes:  No, before departure, a lot of things must be prepared such as the route plan, safety,... to be able to fly safely, efficiently and at the highest performance.  Also, before departure, a lot of things must be prepared such as the route plan, safety,... to be able to fly safely, efficiently and at the highest performance.  Yes, before departure, a lot of things must be prepared such as the route plan, safety,... to be able to fly safely, efficiently and at the highest performance.